Stihl Ht 75 Owners Manual
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STIHJ.: Warning! Forsafeoperationfollowallsafety precautionsinInstructionManual- improper usecancauseseriousinjury. Advertencia! Parasuseguridadduranteelmanejodeeste producto,sigasiemprelasprecaucionesde seguridaddadasenelmanualde instrucciones-elusoindebidopuedecausar lesionesgraves.
1 HT 70, HT 75english Printing inks contain vegetable oils; paper can be recycled. Printed on chlorine-free paper. © ANDREAS STIHL AG & Co. KG, 2003 0458 390 3021. M7. D3. PM. Printed in USA STIHlContentsGuide to Using this Manual .............. 2 Safety Precautions ........................... 3 Using the Pole Pruner .................... 13 Mounting the Bar and Chain ........... 16 Tensioning the Saw Chain .............. 17 Checking Chain Tension ................. 17 Adjusting the Throttle Cable* ............................................. 17 Fuel ................................................ 18 Fueling ............................................ 19 Chain Oil ......................................... 20 Filling Chain Oil Tank ...................... 20 Checking Chain Lubrication ........... 21 Adjusting Telescopic Shaft .............. 21 Fitting the Harness ......................... 22 Starting / Stopping the Engine ...................................... 23 Operating Instructions .................... 27 Taking Care of Guide Bar ............... 28 Cleaning the Air Filter ..................... 28 Motor Management ........................ 29 Adjusting the Carburetor ................ 29 Spark Arresting Screen* in Muffler . 31 Checking the Spark Plug ................ 31 Replacing the Starter Rope and Rewind Spring ......................... 32 * ........see “Guide to Using this Manual“Storing the Machine ....................... 35 Checking the Chain Sprocket ......... 35 Replacing Chain Sprocket .............. 36 Maintaining and Sharpening Saw Chain ...................................... 36 Maintenance Chart ......................... 41 Parts and Controls ......................... 42 Specifications ................................. 44 Special Accessories ....................... 45 Maintenance and Repairs .............. 45 STIHL Incorporated Federal and California Emission Control Warranty Statement ........................ 46Allow only persons who understand this manual to operate your pole pruner. To receive maximum performance and satisfaction from your STIHL pole pruner, it is important that you read and understand the maintenance and safety precautions, starting on page 3, before using your pole pruner. Contact your STIHL dealer or the STIHL distributor for your area if you do not understand any of the instructions in this manual. ! Warning! Because a pole pruner is a high-speed cutting tool with a very long reach some special safety precautions must be observed to reduce the risk of personal injury. Careless or improper use may cause serious or even fatal injury. STIHLs philosophy is to continually improve all of its products. As a result, engineering changes and improve- ments are made from time to time. If the operating characteristics or the appearance of your pole pruner differ from those described in this manual, please contact your STIHL dealer for information and assistance.
2 english HT 70, HT 75PictogramsAll the pictograms attached to the machine are shown and explained in this manual. The operating and handling instructions are supported by illustrations.Symbols in textThe individual steps or procedures described in the manual may be marked in different ways: :Step or procedure without direct reference to an illustration. Description of step or procedure that refers directly to the illustration and contains item numbers that appear in the illustration. Example: Loosen the screw (1) Lever (2) ...In addition to the operating instructions, this manual may contain paragraphs that require your special attention. Such paragraphs are marked with the symbols described below: Warning where there is a risk of an accident or personal injury or serious damage to property. Warning where there is a risk of damaging the machine or individual components. Note or hint which is not essential for using the machine, but may improve the operator’s under- standing of the situation and result in better use of the machine. Note or hint on correct procedure in order to avoid damage to the environment. Equipment and featuresThis instruction manual refers to several models with different features. Components that are not installed in all models and related applications are marked thus *. Such components are available as special accessories from your STIHL dealer. Engineering improvementsSTIHL’s philosophy is to continually improve all of its products. As a result, engineering changes and improvements are made from time to time. If the operating characteristics or the appearance of your machine differ from those described in this manual, please contact your STIHL dealer for assistance. Therefore, we cannot be responsible for changes, modifications or improvements not covered in this manual. Guide to Using this Manual
3 HT 70, HT 75english The use of any pole pruner may be hazardous. The pole pruner chain has many sharp cutters. If the cutters contact your flesh, they will cut you, even if the chain is not moving. At full throttle, the chain speed can reach 68 mph (30 m/s). It is important that you read, fully understand and observe the following safety precautions and warnings. Read the owners manual and the safety instructions periodically. All safety precautions that are generally observed when working with an axe or a hand saw also apply to the operation of pole pruners. However, because a pole pruner is a high-speed, fast-cutting power tool with a very long reach, special safety precautions must be observed to reduce the risk of personal injury. Have your STlHL dealer show you how to operate your pole pruner. Observe all applicable local safety regulations, standards and ordinances. ! Warning! Minors should never be allowed to use a pole pruner. Bystanders, especially children, and animals should not be allowed in the area where a pole pruner is in use. Never let the pole pruner run unattended. The pole pruner user is responsible for accidents or risks involving third parties or their property! Do not lend or rent your pole pruner without the owners manual. Be sure that anyone using your pole pruner reads and understands the information contained in this manual. These safety precautions and warnings apply to the use of all STIHL pole pruners. Different models may have different parts and controls. See the appropriate section of your owners manual for a description of the controls and function of the parts of your model pole pruner.Safe use of a pole pruner involves: 1. the operator 2. the pole pruner 3. the use of the pole pruner THE OPERATORPhysical Condition You must be in good physical condition and mental health and not under the influence of any substance (drugs, alcohol etc.) which might impair vision, dexterity or judgment. Do not operate a pole pruner when you are fatigued. Be alert – if you get tired while operating your pole pruner, take a break. Tiredness may result in loss of control. Working with any pole pruner can be strenuous. If you lack sufficient strength to maintain control of the pruner, do not use it. If you have any condition that might be aggravated by strenuous work, check with your doctor before operating a pole pruner. Safety Precautions
4 english HT 70, HT 75! Warning! Prolonged use of pole pruners (or other machines) exposing the operator to vibrations may produce whitefinger disease (Raynauds phenomenon) or carpal tunnel syndrome. These conditions reduce the hands ability to feel and regulate temperature, produce numbness and burning sensations and may cause nerve and circulation damage and tissue necrosis. All factors which contribute to whitefinger disease are not known, but cold weather, smoking and diseases or physical conditions that affect blood vessels and blood transport, as well as high vibration levels and long periods of exposure to vibration are mentioned as factors in the development of whitefinger disease. In order to reduce the risk of whitefinger disease and carpal tunnel syndrome, please note the following::Most STIHL power tools are available with an anti-vibration (AV) system designed to reduce the transmission of vibrations created by the engine to the operators hands. An AV system is recommended for those persons using power tools on a regular or sustained basis. :Wear gloves and keep your hands warm. :Keep the AV system well maintained. A pole pruner with loose components or with damaged or worn AV buffers will tend to have higher vibration levels. :Maintain a firm grip at all times, but do not squeeze the handles with constant, excessive pressures, take frequent breaks. All the above mentioned precautions do not guarantee that you will not sustain whitefinger disease or carpal tunnel syndrome. Therefore continual and regular users should monitor closely the condition of their hands and fingers. If any of the above symptoms appear, seek medical advice immediately. ! Warning! The ignition system of your unit produces an electromagnetic field of a very low intensity. This field may interfere with some pacemakers. To reduce the risk of serious or fatal injury, persons with pacemaker should consult their physician and the pacemaker manufacturer before operating this tool. Proper Clothing Clothing must be sturdy and snug-fitting, but allow complete freedom of movement. Avoid loose- fitting jackets, scarves, neckties, jewelry, flared or cuffed pants, or anything that could become entangled with the pruner or brush. Wear overalls or jeans with reinforced cut retardant inserts. Wear gloves to improve your grip and help protect your hands when handling the pole pruner and saw chain. Heavy- duty, nonslip gloves are recommended. Good footing is most important in pole pruner work. Wear sturdy boots with nonslip soles. Steel- toed safety boots are recommended.
5 HT 70, HT 75english To reduce the risk of injury to your eyes never operate a pole pruner unless wearing goggles or properly fitted safety glasses with adequate top and side protection complying with ANSI Z 87.1. To reduce the risk of injury to your face, STIHL recommends that you also wear a face shield or face screen over your goggles or safety glasses. Wear an approved safety hard hat to reduce the risk of head injury. Pole pruner noise may damage your hearing. Always wear sound barriers (ear plugs or ear mufflers) to reduce the risk of hearing loss. Continual and regular users should have their hearing checked regularly. THE POLE PRUNERFor illustrations and definitions of the parts of the pole pruner see the chapter on Parts and Controls and Definitions. ! Warning! Never modify a pole pruner in any way. Only attachments and parts supplied by STIHL or expressly approved by STIHL for use with the specific STIHL pole pruner models are authorized. Although certain unauthorized attachments are useable with the STIHL powerhead, their use may, in fact, be extremely dangerous. Use the unit only with the recommended saw chain and guide bar – a longer bar makes the unit difficult to control. THE USE OF THE UNITTransporting the pole pruner! Warning! Always stop the engine before putting a pole pruner down or carrying it. Carrying a pole pruner with the engine running is extremely dangerous. Accidental acceleration of the engine can cause the chain to rotate. ! Warning! During operation, the powerhead muffler and the material around it reach extremely high temperatures. Avoid touching the hot muffler – you could receive serious burns! By hand: When carrying your pole pruner by hand, the engine must be stopped and the pole pruner must be in the proper position. The chain guard (scabbard) should be over the chain and the guide bar, which should point backwards. When carrying your pole pruner, the bar should be behind you. By vehicle: When transporting in a vehicle, keep chain and bar covered with the chain guard. Properly secure your pole pruner to prevent turnover, fuel spillage and damage to the pole pruner. 390BA000 KN
6 english HT 70, HT 75 Preparation for the use of the pole pruner Take off the chain guard and inspect for safety in operation. For assembly, follow the procedure described in the chapter Mounting the Bar and Chain of your owners manual. STIHL Oilomatic chain, guide bar and sprocket must match each other in gauge and pitch.! Warning! Proper chain tension is extremely important. In order to avoid improper setting, the tensioning procedure must be followed as described in your manual. Always make sure the hex nut(s) for the sprocket cover is (are) tightened securely after tensioning the chain. Never start the pole pruner with the sprocket cover loose. Check chain tension once more after having tightened the nut(s) and thereafter at regular intervals (whenever the pole pruner is shut off). If the chain becomes loose while cutting, shut off the engine and then tighten. Never try to tighten the chain while the engine is running!Fueling Your STIHL pole pruner uses an oil- gasoline mixture for fuel (see chapter Fuel of your owners manual). ! Warning! Gasoline is an extremely flammable fuel. If spilled or ignited by a spark or other ignition source, it can cause fire and serious burn injury or property damage. Use extreme caution when handling gasoline or fuel mix. To reduce the risk of fire or burn injury, do not smoke while using or standing near the machine. Combustible fuel vapor may escape from the fuel system. Dust (e.g. wood dust), vapor (e.g. oil mist from the chain lubricating system) and smoke containing chemical substances may be produced when using this machine. These substances may cause serious injuries and health risks such as respiratory illnesses, cancer, genetic defects or hereditary damage. If the risks associated with the possible dust, vapor and smoke emissions are not known, you should obtain the relevant information from the contractor or the responsible control body. If it is not possible to avoid considerable amounts of dust, vapor or smoke being generated in spite of using the proper working techniques, it is recommended that the operator and bystanders wear respirators approved for the substances concerned. Fueling Instructions Fuel your pole pruner in well-ventilated areas, outdoors only. Always shut off the engine and allow it to cool before refueling. Gasoline vapor pressure may build up inside the gas- tank of a two cycle engine depending on the fuel used, the weather conditions, and the venting system of the tank.
7 HT 70, HT 75english In order to reduce the risk of burns or other personal injury from escaping gas vapor and fumes, remove the fuel cap on the STIHL product carefully so as to allow any pressure build-up in the tank to release slowly. Never remove fuel filler cap while engine is running. Select bare ground for fueling and move at least 10 feet (3 m) from fueling spot before starting the engine. Wipe off any spilled fuel before starting your pole pruner, and check for leakage. Check for fuel leakage while refueling and during operation. If fuel or oil leakage is found, do not start or run the engine until leak is fixed and spilled fuel has been wiped away. Take care not to get fuel on your clothing. If this happens, change your clothing immediately. ! Warning! Unit vibrations can cause an improperly tightened fuel cap to loosen or come off and spill quantities of fuel. In order to reduce risk of fuel spillage and fire, tighten fuel cap by hand with as much force as possible. Check fuel cap periodically for tightness. Starting ! Warning! Your pole pruner is a one-person unit. Do not allow other persons to be near the running pole pruner. Keep bystanders at least 15 m (50 ft) away. Start and operate your pole pruner without assistance. For specific starting instructions, see the appropriate section of the Owners Manual. Proper starting methods reduce the risk of injury.Place the pole pruner on firm ground or other solid surface in an open area or in the alternate as shown in the above picture. Maintain a good balance and secure footing. ! Warning! To reduce the risk of injury from loss of control, be sure that the guide bar and chain are clear of you and all other obstructions and objects, including the ground. When the engine is started, the engine speed with the starting throttle lock engaged will be fast enough for the clutch to engage the sprocket and turn the chain. Never attempt to start the pole pruner when the guide bar is in a cut or kerf. 390BA022 KN
8 english HT 70, HT 75 When you pull the starter grip, do not wrap the starting rope around your hands. Do not allow the grip to snap back, but guide the starter rope slowly back to permit the rope to rewind properly. Failure to follow this procedure may result in injury to hand or fingers and may damage the starter mechanism. Important adjustments! Warning ! To reduce the risk of personal injury from loss of control or contact with the running chain, do not use a pole pruner with incorrect idle adjustment. At correct idle speed, the chain should not rotate. For directions to adjust idle speed, see the appropriate section of your owners manual. If you cannot set the correct idle speed, have your STIHL dealer check your pole pruner and make proper adjustments or repairs. After adjusting chain tension, start the pole pruner, let the engine run for a while, then switch engine off and recheck chain tension. Proper chain tension is very important at all times.Working Conditions Danger! Risk of Electrocution! This pruner is not insulated against electric shock. Approaching or contacting electric power lines with a pruner may cause death by electrocution or serious bodily injury. Electricity can jump from one point to another by means of arcing. Higher voltage increases the distance electricity can arc. Electricity can also move through branches, especially if they are wet. Maintain a clearance of at least 15 m (50 ft) between the pruner (including any branches it is contacting) and any electrical line carrying live current. Before working with less clearance, contact your electric utility and make sure current is turned off. ! Warning! The pole pruner has a large range. In order to reduce the risk of personal or even fatal injury to bystanders from falling objects and thrown pieces of wood or in advertent contact with the rotating chain of the pruner always keep bystanders at least 15 m (50 ft) away when the pole pruner is running. Operate your pole pruner only outdoors in a ventilated area. ! Warning! Your pole pruner produces toxic exhaust fumes as soon as the combustible engine is running. These gases (e.g. carbon monoxide) may be colorless and odorless. To reduce the risk of serious or fatal injury from breathing toxic fumes, never run the pole pruner indoors or in poorly ventilated locations. 15m (50ft) 15m (50ft)
9 HT 70, HT 75english ! Warning! Use of this product (including sharpen- ing the saw chain) can generate dust, mists and fumes containing chemicals known to cause respiratory disease, cancer, birth defects, or other reproductive harm. If you are unfamiliar with the risks associated with the particular dust, mist or fume at issue, consult your employer, governmental agencies such as OSHA and NIOSH and other sources on hazardous materials. California and some other authorities, for instance, have published lists of substances known to cause cancer, reproductive toxicity, etc. Control dust (such as sawdust), mists (such as oil mist from chain lubrication) and fumes at the source where possible. In this regard use good work practices and follow the recommendations of OSHA / NIOSH and occupational and trade associations. When the inhalation of toxic dust, mists and fumes cannot be eliminated, the operator and any bystanders should always wear a respirator approved by NIOSH / MSHA for the type substance at issue. ! Warning! Breathing asbestos dust is dangerous and can cause severe or fatal injury, respiratory illness or cancer. The use and disposal of asbestos containing products have been strictly regulated by OSHA and the Environmental Protection Agency. Do not cut or disturb asbestos, asbestos containing products (e.g. asbestos containing drywall or other construction products), or products such as pipes which are wrapped or covered with asbestos insulation. If you have any reason to believe that you might be cutting asbestos, immediately contact your employer or a local OSHA representative. ! Warning! The muffler and other parts of the engine (e.g. fins of the cylinder, spark plug) become hot during operation and remain hot for a while after stopping the engine. To reduce risk of burns do not touch the muffler and other parts while they are hot. Operate the pole pruner under good visibility and daylight conditions only. Dont work alone. Keep within calling distance of others in case help is needed. ! Warning! Take extreme care in wet and freezing weather and in slippery conditions (rain, snow, ice). Put off the work when the weather is windy, stormy or rainfall is heavy. ! Warning! Avoid stumbling on obstacles such as stumps, roots or rocks and watch out for holes or ditches. Be extremely cautious when working on slopes or uneven ground.